src/tests/current_allocated_bytes_test.cc

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// Author: Craig Silverstein

// This tests the accounting done by tcmalloc.  When we allocate and
// free a small buffer, the number of bytes used by the application
// before the alloc+free should match the number of bytes used after.
// However, the internal data structures used by tcmalloc will be
// quite different -- new spans will have been allocated, etc.  This
// is, thus, a simple test that we account properly for the internal
// data structures, so that we report the actual application-used
// bytes properly.

#include "config_for_unittests.h"
#include <stdlib.h>
#include <stdio.h>
#include <gperftools/malloc_extension.h>
#include "base/logging.h"

int main() {
  // We don't do accounting right when using debugallocation.cc, so
  // turn off the test then.  TODO(csilvers): get this working too.
#ifdef NDEBUG
  static const char kCurrent[] = "generic.current_allocated_bytes";

  size_t before_bytes, after_bytes;
  MallocExtension::instance()->GetNumericProperty(kCurrent, &before_bytes);
  free(malloc(200));
  MallocExtension::instance()->GetNumericProperty(kCurrent, &after_bytes);

  CHECK_EQ(before_bytes, after_bytes);
#endif
  printf("PASS\n");
  return 0;
}